How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Tom Your Own Question
Tom, Technician
Category: Small Engine
Satisfied Customers: 25954
Experience:  Honda Platinum Technician
Type Your Small Engine Question Here...
Tom is online now
A new question is answered every 9 seconds

I have a Karcher K5.55 and it pulsates when not in use and

Resolved Question:

I have a Karcher K5.55 and it pulsates when not in use and only operates at half pressure when in use
Submitted: 7 years ago.
Category: Small Engine
Expert:  Tom replied 7 years ago.
OK has the unloader valve been checked this will cause this issue.
Customer: replied 7 years ago.
Which is the unloader valve and how do you check it, what is their to check?
Expert:  Tom replied 7 years ago.
These are known to get stuck open and cause this issue . Takes about 40
minutes to fix and you will save yourself about 150 dollars on a repair . Here's how. If you pry off the silver cap, remove the black cover, use an allen wrench to remove the two "star" screws (or you can remove the four engine mounts and remove the whole engine), lift out the white plastic part with the brass needle & spring, finally lift out the stainless steel piston or like I had to start up the engine (make sure you have the water hooked up and running) and watch the piston be shoot out (I placed a towel over the piston before starting the engine). Then you can put white lithium grease all over the piston and reassemble.

Hoped this helped

Positive feedback and bonuses greatly appreciated.
Tom and other Small Engine Specialists are ready to help you